Preheat oven to 375 degrees farenheit.,Sprinkle pork roast with salt and pepper and place on a rack in a roasting pan.,Roast for two hours or until temperature of center of pork registers 150-160 degrees (145 degrees is the new "safe" temp for pork.).,______,Remove roast from pan, saving the drippings and juice.,Add Au Jus mix and water to drippings and cook according to directions on package.,Place bread in the oven (which has been turned off just after the roast is done) and let it crisp a bit. The heat will help to melt the cheese better than just the heat of the meat will.,Let roast cool for about 10 minutes, then slice thinly.,Pile pork and cheese on bread while meat is still hot.,Serve with Au Jus dipping gravy on the side and LOTS o' napkins.